While I do agree, I kinda find them more to both Thaumatruge and Conjurer...since a Geomancer uses all 6 aspects of nature, Wind, Water, Earth, Fire, Ice and Thunder. Maybe a Job class using the two as the base and allowing you to use both sets as Cross Class abilities? They'd have to allow Thaumaturges to use Conjurer abilities or vice versa. Can't really see it working without full elemental support.